an error appears for the front wheels things are a little simpler than
for error codes for the rear wheels. In the case of the rear
wheels because there are two shocks per wheel it will be unclear which
of the two shocks are at fault. Perhaps even both have failed.
there are no problems with all the shocks the error light will come back
on and flash rapidly and continuously at 5Hz.
Second Test Level.
This brings us to the second phase of
diagnostic testing. This is used if a faulty shock is
indicated in the above test. It checks if the problem is related to one
or more of the actual shocks or is due to some other part of the
suspension control system. Start the test by first pressing the
"Auto" button. Again the error light will flash at
0.6Hz. Disconnect the electrical connection going to the shock
absorber. It is a 3 pin socket (see figure 6). Obtain a simple voltmeter. Press the
"Auto" button one more time. Measure the voltage between
pin 2 and 3 of the connection from the car to the shock absorber. It
should be between 0.7 to 1.3 volts. The voltage between pin 1 and
3should be between 10 to 15 volts. If these values are
correct the system itself is OK and the failure is in the shock
absorber(s) itself. Sometimes the shock is OK, its the electrical
connection in the connector that is bad. A spray of TV tuner lubricant
can quickly fix the problem!
6. 3 pin electrical socket to front shock. Note also nozzle
for hydraulic fluid to raise car
7. Wires of electrical control to rear shock absorbers
8. Electrical connection socket for rear shock. (Two per wheel).
Third Test Level.
The third test of
the suspension system is to make sure the speed sensor to the ride
control system is working
correctly. Again we press the "Auto" button. The error
light will flash again at 0.6Hz. Press the auto button again. At this
point the error light will stay on. Drive the car at increasing
speed. The light should start flashing at about 20 MPH. If it stays
permanently on, there may be a connection problem with the speed
indicator in the car. This will lock the suspension into a (stiff)
3 setting mode.
After all tests are
completed remember to reset the computer switch under the passenger side
dashboard. Switch off the ignition switch, this will reset the computer
controlled shock absorber to its normal functional mode.